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Preparation method of biomass carbon-based electrode for asymmetric capacitance desalting device

A biomass carbon, asymmetric technology, applied in the field of water treatment, can solve the problems of complex process and uneven doping, and achieve the effects of easy acquisition, improved pseudocapacitance, enhanced conductivity and wettability

Pending Publication Date: 2020-12-04
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention uses shrimp and crab shells as a precursor to synthesize nitrogen-doped porous carbon materials under an inert atmosphere, and adds green additives during the synthesis process to prepare nitrogen-doped porous carbon electrode materials. Organic components in shrimp and crab shells can be used as nitrogen sources and carbon source, which can overcome the problems of complex process and uneven doping of additional nitrogen source introduced in the previous preparation process

Method used

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Examples

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Effect test

Embodiment 1

[0035] A method for preparing a biomass carbon-based electrode for an asymmetric capacitive desalination device, comprising the steps of:

[0036] (1) After cleaning the shrimp shells, ultrasonically treat them for 4 hours, then take them out, place them in a blast drying oven, and dry them at 60°C for 24 hours;

[0037] (2) Grinding the dried shrimp shells into powder, then raising the temperature to 450°C at a rate of 2°C / min under the protection of nitrogen, keeping it warm for 2h, and then cooling to room temperature to obtain a carbonized product;

[0038] (3) Add potassium bicarbonate to the carbonized product, the weight ratio of the two is 1:1, then raise the temperature to 800°C at a rate of 2°C / min under the protection of nitrogen, keep it warm for 2h, and acidify the obtained mixture with 1M hydrochloric acid solution After washing, wash with water until neutral, then filter and dry to obtain nitrogen-doped porous carbon;

[0039] (4) Sulfide-modified and positive-ch...

Embodiment 2

[0046] A method for preparing a biomass carbon-based electrode for an asymmetric capacitive desalination device, comprising the steps of:

[0047] (1) After cleaning the shrimp shells, ultrasonically treat them for 5 hours, then take them out, place them in a blast drying oven, and dry them at 60°C for 24 hours;

[0048] (2) Grinding the dried shrimp shells into powder, then raising the temperature to 500°C at a rate of 1°C / min under nitrogen protection, keeping it warm for 2h, and then cooling to room temperature to obtain a carbonized product;

[0049] (3) Add potassium citrate to the carbonized product, the weight ratio of carbonized product to potassium citrate is 1:3, then raise the temperature to 900°C at a rate of 1°C / min under the protection of nitrogen, keep it warm for 1h, and the obtained mixture After pickling with 1M hydrochloric acid solution, washing with water until neutral, then filtering and drying to obtain nitrogen-doped porous carbon;

[0050] (4) Sulfide...

Embodiment 3

[0057] A method for preparing a biomass carbon-based electrode for an asymmetric capacitive desalination device, comprising the steps of:

[0058] (1) After cleaning the crab shells, ultrasonically treat them for 6 hours, then take them out, place them in a blast drying oven, and dry them at 60°C for 24 hours;

[0059] (2) Crush the dried crab shells into powder, then raise the temperature to 500°C at a rate of 2°C / min under the protection of nitrogen, keep it warm for 2h, and then cool to room temperature to obtain a carbonized product;

[0060] (3) Add potassium bicarbonate to the carbonized product, the weight ratio of carbonized product to potassium bicarbonate is 1:1, then raise the temperature to 1000°C at a rate of 3°C / min under the protection of nitrogen, keep it warm for 2 hours, and cool to room temperature , after the obtained mixture was pickled with 1M hydrochloric acid solution, washed with water until neutral, then filtered and dried to obtain nitrogen-doped por...

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Abstract

The invention relates to a preparation method of a biomass carbon-based electrode for an asymmetric capacitance desalting device, which comprises the following steps: cleaning shrimp and crab shells,carrying out ultrasonic treatment, drying, pulverizing into powder, carbonizing in an inert atmosphere, adding an activator into a carbonized product, heating to 800-1200 DEG C under the protection ofinert gas, keeping the temperature for 2-4 hours, cooling, pickling, washing with water, filtering, and drying to obtain nitrogen-doped porous carbon; respectively carrying out sulfide modification and positive charge modification on the nitrogen-doped porous carbon, dispersing the modified nitrogen-doped porous carbon, acetylene black and polytetrafluoroethylene in absolute ethyl alcohol, evaporating to a paste, coating conductive substrate graphite paper with the paste, drying, and assembling to form an asymmetric electrode, wherein the positive electrode is positive charge modified nitrogen-doped porous carbon, and the negative electrode is sulfide-modified nitrogen-doped porous carbon. According to the method, the shrimp and crab shells are used as precursors, a nitrogen source does not need to be additionally added, raw materials are easy to obtain, cost is low, large-scale production can be achieved, and the prepared electrode is large in adsorption capacity and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method of a biomass carbon-based electrode for an asymmetric capacitor desalination device. Background technique [0002] The shortage of water resources has become one of the biggest resource crises facing the world, and desalination of seawater and brackish water is an important way to solve this crisis. Existing desalination technologies mainly include membrane method and distillation method. Among them, the membrane method mainly includes reverse osmosis and electrodialysis; the distillation method mainly includes multi-stage flash evaporation and multi-effect distillation. However, these traditional desalination technologies have some unavoidable problems. For example, the selective semi-permeable membrane used in the reverse osmosis method has high cost, large equipment investment, high operating pressure, easy clogging of membrane compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 严金龙王慧全桂香王羽赵之韵
Owner YANCHENG INST OF TECH
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